天然气替代率对混燃式气体机放热率的影响
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摘要
为了研究船用混燃式气体机的燃烧放热特性,本文提出采用三条Vibe曲线模拟混燃式气体机的燃烧放热率方式,在Matlab/Simulink平台上建立相应的缸内过程模型,并根据该模型提出一种新的混燃式气体机放热率的计算方法。通过该方法计算出不同替代率下的放热率,分析天然气替代率对混燃式气体机燃烧特性的影响。研究结果表明:本文建立的混燃式气体机的放热率计算模型,能够较精确地预测混燃式气体机在全工况范围内的放热率。同时,随着天然气替代率的提高,燃烧开始角延后,燃烧结束角提前,柴油的预混合燃烧阶段占整个柴油的燃烧过程中的比例相对增大。尽管混燃式气体机的排放相较于柴油机得到较好的改善,但其输出动力性降低。
To study the combustion characteristics of a marine dual fuel engine,three Vibe functions are used to calculate the heat release rate of the dual fuel engine,and a corresponding in-cylinder process model is built in Matlab/Simulink. A new method is then proposed to calculate the heat release rate of the dual fuel engine,and the influence of the natural gas substitution rate on the combustion characteristics is analyzed. Results show that the model built in this paper can predict the heat release rate of the dual fuel engine with a high accuracy in all working conditions. Furthermore,it is also found,that with an increase in the natural gas substitution rate,the combustion start angle delays while the combustion end angle advances. In addition,the diesel pre-mixed combustion stage accounts for a larger proportion of the whole diesel combustion process. In conclusion,the dual fuel engine provides an enhanced emission performance,but the output power is reduced.
To study the combustion characteristics of a marine dual fuel engine,three Vibe functions are used to calculate the heat release rate of the dual fuel engine,and a corresponding in-cylinder process model is built in Matlab/Simulink. A new method is then proposed to calculate the heat release rate of the dual fuel engine,and the influence of the natural gas substitution rate on the combustion characteristics is analyzed. Results show that the model built in this paper can predict the heat release rate of the dual fuel engine with a high accuracy in all working conditions. Furthermore,it is also found,that with an increase in the natural gas substitution rate,the combustion start angle delays while the combustion end angle advances. In addition,the diesel pre-mixed combustion stage accounts for a larger proportion of the whole diesel combustion process. In conclusion,the dual fuel engine provides an enhanced emission performance,but the output power is reduced.
引文
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[18]DING Yu.Characterising combustion in diesel engines:using parameterised finite stage cylinder process models[D].Delft:Delft University of Technology,2011.
[2]BHANDARI K,BANSAL A,SHUKLA A,et al.Performance and emissions of natural gas fueled internal combustion engine:A review[J].2005,5(64):333-338.
[3]TILAGONE R,VENTURI S,MONNIER G.Natural gas-an environmentally friendly fuel for urban vehicles:the smart demonstrator approach[R].SAE Technical Paper,2005.
[4]EPA.Clean alternative fuels:compressed natural gas[EB/OL].http://nepis.epa.gov/Exe/Zy PURL.cgi?Dockey=P100OHL3.TXT,2002.
[5]冯立岩.我国气体燃料大型船用主机发展策略探讨[J].柴油机,2011(5):6-10.FEN Liyan.Discussion on the development strategy of large marine gas engine in China[J].Diesel engine,2011(5):6-10.
[6]李树生.高性能大功率天然气发动机燃烧系统开发研究[D].济南:山东大学,2013.LI Shusheng.Development of high-performance and largepower natural gas engine combustion system[D].Ji'nan:Shandong University,2013.
[7]MAVRELOS C,THEOTOKATOS G.Modelling and parametric investigation of a large marine two-stroke dual fuel engine[C]//Proceedings of the 11th International Symposium of Marine Engineering.Tokyo,Japan,2017:174-179.
[8]KHAN M O.Dual-fuel combustion phenomena[D].London:Imperial College of Science and Technology,1969.
[9]PIROUZPANAH V,AMIRASLANI K.A model to predict performance and heat release of dual-fuel diesel engines[C]//Proceedings of Symposium on Gas Engines and Cogeneration.London,UK,1990.
[10]WHITEHOUSE N D,WAY R J B.A simple method for the calculation of heat release rates in diesel engines based on the fuel injection rate[R].Manchester:University of Manchester Institute of Science&Technology,1971.
[11]KRISHNAN S R,BIRUDUGANTI M,MO Y,et al.Performance and heat release analysis of a pilot-ignited natural gas engine[J].International journal of engine research,2002,3(3):171-184.
[12]尧命发,段家修,覃军,等.双燃料发动机燃烧放热规律分析及燃烧特性研究[J].内燃机学报,2002,20(4):312-316.YAO Mingfa,DUAN Jiaxiu,QIN Jun,et al.An investigation on the heat release rate and the combustion characteristics of dual-fuel engines[J].Transactions of CSICE,2002,20(4):312-316.
[13]崔晓敏,田江平,周俊杰,等.双燃料发动机燃烧放热规律模型及实验研究[J].热科学与技术,2005,4(3):267-271.CUI Xiaomin,TIAN Jiangping,ZHOU Junjie,et al.Heat release rate model and test research for dual-fuel engine[J].Journal of thermal science and technology,2005,4(3):267-271.
[14]KARIM G A.Combustion in gas-fuelled compression ignition engines[C]//Proceedings of ASME Internal Combustion Engines Division Fall Technical Conference.Peoria,Illinois,2000.
[15]姚春德,刘增勇,高昌卿.柴油引燃预混天然气准均质压燃着火过程的研究[J].内燃机学报,2003,21(1):7-12.YAO Chunde,LIU Zengyong,GAO Changqing.Study on HCCI of pre-mixed natural gas ignited by pilot diesel[J].Transactions of CSICE,2003,21(1):7-12.
[16]YAO Chunde,LIU Zengyong,GAO Changqing.Study on the combustion mechanism of diesel fuel pilot-ignited dual fuel engine[J].Journal of engineering thermophysics,2002(06):761-763.
[17]CHANG J,GURALP O,FILIPI Z,et al.New hear transfer correlation for an HCC engine derived from measure ments of instantaneous surface heat flux[R].Sea Technical Paper,2004.
[18]DING Yu.Characterising combustion in diesel engines:using parameterised finite stage cylinder process models[D].Delft:Delft University of Technology,2011.